Framing passersby with light and shadows is a pretty common technique in street photography.
Singapore-based photographer Weilun Chong frames his subjects with something that’s a little more concrete — literally. His “Please Mind the Gap” project features portraits of subway commuters framed in the gaps they’re told to mind.

You know the gaps, right? The little space between the subway platform and the subway train that you need to step across. It’s what stations warn you about when they tell you to “please mind the gap,” and it’s the window through which Chong has been observing lives.

Chong visited subway stations in Singapore and Hong Kong, capturing slices of life on the Mass Rapid Transit (MRT) systems there. It’s an ongoing project that Chong has been working on for the past three years during his daily commutes.